From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-131718-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 8545 invoked by alias); 20 Feb 2005 15:50:08 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
Received: (qmail 8507 invoked by uid 48); 20 Feb 2005 15:50:02 -0000
Date: Sun, 20 Feb 2005 22:33:00 -0000
Message-ID: <20050220155002.8506.qmail@sourceware.org>
From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
In-Reply-To: <20050220030431.20100.hp@gcc.gnu.org>
References: <20050220030431.20100.hp@gcc.gnu.org>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug tree-optimization/20100] [4.0 regression] static call incorrectly judged constant, moved out of loop
X-Bugzilla-Reason: CC
X-SW-Source: 2005-02/txt/msg02398.txt.bz2
List-Id: <gcc-bugs.sourceware.org>


------- Additional Comments From pinskia at gcc dot gnu dot org  2005-02-20 15:50 -------
And here is a reduced (and self contained) testcase for that case:
int func_pure (void) __attribute__ ((pure));
void func_other (int);
int global_int;
void abort ();
void func_other(int a)
{
  if (a != global_int)
   abort ();
  global_int++;
}

int func_pure(void)
{
  return global_int;
}

int
func_loop (int arg)
{
 // global_int ++;
  while (arg--)
      func_other (func_pure ());
}

int main(void)
{
  func_loop(10);
  return 0;
}

Uncommenting global_int++; will cause the testcase to work as we have vops now.
I think this is just like the testcase which was attached in comment #1 because if I add a variable and 
have it set a global variable, it works too.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20100